My two personal examples of the XM-L2’s offering a higher percentage of Kcd vs lumens -
TN31 XML U2 - 1075 otf at 30sec
122Kcd
TN31 XM-L2 U2 - 1275 otf at 30sec (18.6% increase in lumens)
157Kcd (28.6% increase in throw)
BTU XMl U2 - 2975 otf at 30sec
132Kcd
BTU XM-L2 U2 - 3670 otf at 30sec (23.3% increase in lumens)
181Kcd (37.1% increase in throw)
All these were done with the same batteries and same meter before and after testing. Not sure why, but XM-L2’s to appear do be better throwers than XML’s.
I was showing mine off all week. My son and daughters friends were amazed. It’s like turning on a streetlight in your backyard. Any light that smokes my TN31’s to me is pretty damn mean. This BTU is mean.
The other driver has a 3.8A maximum in turbo (with a 3 minute timer before it steps down) and no PWM on any level.
The DRY Driver in turbo is direct drive, meaning if you have decent batteries you can get over 3.8A easy. There is PWM on levels except turbo but it is very high.
Personally I chose the non dry driver since 3000 lumens is plenty for me. Even up to 4.5A the differences are negligible due to 3 emitters being in one host.